I would suggest only discussing one thing at a time. Since he already stated the cages are cleaned once a month, you could offer to clean the tanks with him when you visit next because you want to because they're so neat and you like holding them. While you are putting in new bedding, you can casually mention how dry it is and mist it properly.
Don't even mention any other changes though. If you go in telling someone that they're doing everything wrong, even if you say it nicely, most people will not want to hear it and will get insulted. One little bit at a time though, you should be able to sneakily change all the husbandry bit by bit. After all, the snakes have been living in these conditions a while without dying. If you can improve it a little at a time, it'ss much better than the guy shutting down and refusing to talk to you because he feels insulted.
Also try being enthusiastic if you bring any new information in. If you print off a sheet of basic info and take it over to show off what you found and you discuss one of the aspects, you can engage him and after you leave, he might pick it up and read the rest tooo.
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